ORIENTATION DEPENDENCE OF THE STICKING PROBABILITY OF NO AT NI(100)

被引:21
作者
FECHER, GH
VOLKMER, M
PAWLITZKY, B
BOWERING, N
HEINZMANN, U
机构
[1] Fakultät für Physik, Universität Bielefeld
关键词
D O I
10.1016/0042-207X(90)90330-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In a molecular beam experiment we have measured the sticking probability of NO at Ni(100) as a function of coverage and molecular orientation. The NO molecules in the 2∏1/2|1/2, 1/2, 1/2> ground state are state selected by use of an electrostatic hexapole. The orientation was produced by a homogeneous electric field. The initial sticking probability is found to be higher for N-end collisions. The asymmetry of the initial sticking probability was found to depend linearly on the degree of molecular orientation. This effect is of the order of 70% with respect to the degree of orientation. The orientation dependence of the sticking probability as a function of coverage shows that the asymmetry is nearly constant up to saturation coverage. These results indicate that a simple picture of the adsorption process including only trapping into a 'precursor' state, and neglecting direct chemisorption, cannot explain the adsorption kinetics of NO at Ni(100). © 1990 Pergamon Press plc.
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收藏
页码:265 / 268
页数:4
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